PF: Is it possible to change the Third country host of a Postdoctoral Global Fellowship after signing the Grant Agreement - either the supervisor or the organisation?

It may be possible if the challenges are insurmountable.

Firstly, the fellow and the beneficiary should of course try to solve the issues and also document the process.

But if that fails, they should contact their Project Officer. Best practice would be to already be able to suggest an alternative that would ensure that the project could be implemented according to/or as close as possible to what has been evaluated.